Originally Posted by ghettojesusxx
Mind flayers live up to about 125-135 years.
Where does this come from? Mind Flayers usually don't die of old age, I doubt they age at all. Mind Flyer can evolve further to become a part of the Elder Brain - the base part or some additional alongside others.
This is all from the BG3 lore, I don't know if some common DnD lore contradicts this.